NOMA-Based Energy-Efficient Wireless Powered Communications in 5G Systems

2017 IEEE 86th Vehicular Technology Conference (VTC-Fall) Pub Date : 2017-09-01 DOI:10.1109/VTCFall.2017.8288114

T. A. Zewde, M. C. Gursoy

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引用次数: 10

Abstract

In this paper, we study the performance of non-orthogonal multiple access (NOMA) scheme in wireless-powered communication networks (WPCN) focusing on the system energy efficiency. We consider multiple energy-harvesting user equipments (UEs) that operate based on harvest-then-transmit protocol. The uplink information transfer is carried out by using power-domain multiplexing, and the receiver decodes each UE's data in such a way that the UE with the best channel gain is decoded without interference. In order to determine optimal resource allocation strategies, we formulate optimization problems considering two models, namely half-duplex operation and asynchronous transmission, based on how downlink and uplink operations are coordinated. In both cases, we have concave-linear fractional problems, and hence Dinkelbach's method can be applied to obtain the globally optimal solutions. Thus, we first derive analytical expressions for the harvesting interval, and then we provide an algorithm to describe the complete procedure. Simulation results are included to justify the theoretical characterizations. In fact, we observe that broadcasting at higher power level is more energy efficient for WPCN with uplink NOMA.

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5G系统中基于noma的高能效无线供电通信

本文从系统能效的角度研究了无线供电通信网络(WPCN)中非正交多址(NOMA)方案的性能。我们考虑了基于收集-传输协议的多个能量收集用户设备(ue)。利用功率域复用进行上行信息传输，接收器对各UE的数据进行解码，使具有最佳信道增益的UE在不受干扰的情况下进行解码。为了确定最优的资源分配策略，我们根据上下行操作如何协调，制定了考虑半双工操作和异步传输两种模型的优化问题。在这两种情况下，我们都有凹线性分数型问题，因此可以使用Dinkelbach方法来获得全局最优解。因此，我们首先推导了收获间隔的解析表达式，然后提供了描述整个过程的算法。仿真结果证明了理论描述的正确性。事实上，我们观察到在更高的功率水平下广播对于具有上行NOMA的WPCN来说更节能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)

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